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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) | Sep. 30, 2020 USD ($)
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Held-to-maturity Securities | $ 0
Accrued interest receivable for investment securities | 11,400,000
Threshold Net Book Balance, Individually Evaluated Loans | 1,000,000.0
Interest Receivable | 97,800,000
Liability Recorded for Expected Credit Losses on Unfunded Commitments | 43,200,000
Other Assets |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Interest Receivable | 97,800,000
Other Liabilities |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Liability Recorded for Expected Credit Losses on Unfunded Commitments | $ 43,200,000

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